Plus there's the whole part where he worked for the government on classified projects.
04 March 2014. Hmm. Seems to me that if I were trying really hard to convince the world that I was not some crazy crypto-anarchist, I would have routinely participated in local government throughout the years. I might also write letters to city gov in crappy, broken english so that people say "yeah, defo not Satoshi." The man worked for the U.S. Gov for many years in top-security-clearance research positions, likely had to write many reports, the chance that he actually writes like a 7th grader is slim to none.
His brother claimed he had a stroke at some point, could be after he wrote bitcoin. A stroke can cause mental impairment. If he did have a stroke he might not even remember how to access his old private keys.
Also, when people get older they tend to speak more slowly, I've noticed. Even if they were very intelligent when they were younger.